Water heater assembly



Feb.3, 1953 H. L. Mol-IN 2,627,252

WATER HEATER ASSEMBLY Filed Aug. 18, 1949 5 Sheets-Sheet l 30 a/ .erf/4M0R H07 WATER OUTLET fju.

INVENTOR. Heeey L. M0727? ATTURWK ....M 2 2, 7 m m. Y. S TW E y man 1 N2 .t V, R IM S f U ...M N V. B e B m H N S H s r A O R M E s T L m H H RE T A l W lll mw l I I 9 1 Rw. 9 l I I l l I I I l 1. E 7 u 3 A b. ,w eL Fv m Feb. 3, 1953 H. MoHN WATER HEATER ASSEMBLY 5 Sheets-Sheet 5 FiledAug. 18, 1949 .f IIIL:

@E -11,@Tl J,

I N VEN TOR. Hem] L. Mama ATTOR NEY Feb. 3, 1953 H. L. MoHN 2,627,252

WATER HEATER ASSEMBLY Filed Aug. 18, 1949 5 Sheecs--Sheerl 4 IN V ENTOR.

breng L. M0717? Patented Feb. 3, 1953 WATER HEATER ASSEMBLY Henry LeroyMohn, York, Pa., assignor to York- Shipley, Inc., York, Pa., acorporation of Dela- Ware Applicaties August 1s, 1949, serial No.110,931

4; Claims.

This invention relates to heating systems andv more particularly to animproved heating boiler and domestic hot water heating unit`Conventional water heating units and steam generators have been providedwith water tubes and tanks, and with fiue passages for hot combustionproducts extending through the tanks and between the tanks and theboiler casing. Such prior constructions generally include the use ofmultiple flue passages diicult to clean and the use of externalstabilizer tubes or loop.

The heating unit of the present invention provides an eflicient andeconomical assembly having many advantages.

It is an object of this invention to provide a water heating boiler andburner assembly which may be completely contained within a singlehousing, and which provides for heating water or for generating steam,and also provides for heating domestic hot water.

It is another object of this invention to provide a tubeless boilerassembly of relatively high efciency and devoid of external stabilizerpipes or connections.

It is another object of this invention to provide an improved boilerunit including a fuel burner mechanism, circulating pump and draft-connections all within a simple housing.

It is another object of this invention to provide a tubeless boilerassembly having an improved balie arrangement facilitating cleaning ofthe flue passages therein.

It is another object of this invention to provide a boiler assemblyhaving an improved arrangement of iiue passages and enclosing housingwhich assures quiet operation of the heating unit.

It is a further object of this invention to provide an improved heatingboiler and burner assembly which may be manufactured as a packaged unit,and which is easily installed'and connected to residential or otherheating systems.

Other objects and advantages of this invention will be readily apparentfrom the following 'description and the accompanying drawings illus-'trating a preferred embodiment of the invention, wherein,

Figure l is a vertical sectional view of a preferred form of boilerassembly removed from its .housing and taken on line I--I of Figures 2and 3.

Figure 2 is an elevational view of the boiler assembly shown in Figure1.

Figure 3 is a plan view of the top of the boiler assembly shown inFig-ure 2.

Figure 4 is a front elevation View of the outer housing for the .boilerassembly shown in AFigure 2 1 with the position of the boiler and fuelburner indicated in dotted lines.

Figure 5 is a plan view, partly cut away, of the top of the housingshown in Figure 4.

Figure 6 is a plan view, partly cut away, of the top of the housing whenthe boiler assembly is provided with a water circulating pump.

Referring to the drawings, particularly Figure l, the heat exchangerunit includes a tubular upright casing I5 supported above a base plateII by an annular member I2. The tubular casing Ill forms an annularwater wall or jacket closed at the bottom by a ring I3 and closed at thetop by a ring Iii. The water wall jacket II) may be fabricated fromsheet steelA sections suitably joined together and to the rings I3 andI4 by welding. Within the member I2 and on the base plate Ii is a hightemperature cement base I 5 supporting a replaceable combustion chamberformed by blocks I6 of refractory material. Vermiculite nll lI may beprovided as heat insulation between the combustion chamber and themember I2. An opening I8 is provided through the member I2, fill I1 andcombustion chamber wall I6 to receive the combustion tube (not shown) ofa conventional cil burner device. The water jacket I0 is also providedwith an observation and cleanout opening I9 closed by a plate 20.

Supported within the upper portion of the water jacket I0 and extendingabove the top of the jacket is a water tank 22. The tank 22 is connectedto the annular jacket I0 by a connecting nipple 23 and also by acirculation tube 24, the latter extending from the bottom of the tank 22downwardly and then laterally into the water jacket I0 about midway ofthe height of the jacket In. An annular casing member 25 extends abovethe top of the jacket Ill spaced from the cuter surface of the upperportion of tank 22 and closed at the top of the assembly by a circularcover plate 26 which may also serve as a cover for the tank 22. Astabilizer connection 2T, similar to a Hartford loop, extends from theupper portion of the tank 22 outward and then downward through the ringI4 into the water jacket IIl adjacent the return line connection .28..The stabilizer conduit 21 is within the fiue space enclosed by thecasing member 25. The tank 22, member 25, and top 26 may be formed fromsheet steel with welded joints. A tankless type domestic hot waterheating coil 29 is immersed in the water contained in tank 22, and isprovided with inlet and outlet connections 30 extending through the top26. The top 26 is also provided withan outlet connection 3i from whichsteam may be led to conventional radiators, heating panels, or otherdevices. A drain or return connection 32 may be provided at the bottomof the water jacket iii.

The annular space between the tank 22 and the upperportion of waterjacket I and member 25 constitutes a flue or passage for the combustiongases, and is provided with horizontal and vertical baffles which causethe gases to travel around j f the tank in a counter-clockwise spiralApath to a tangential flue outlet 35, shown in Figures 2 and 3. The bafemembers show-n in Figures 1 and 3 include a horizontal baille 36removably supported on angle irons secured to the inner wall of jacketlil and extending between the bottom .of tank 22 and the inner surfaceof water jacket i0. A vertical baile 3l is provided extending from oneend of baffle 35 upwards between the outer surface of tank 22 andtheinner surface of theupper portion of water jacket lo. A secondhorizontal baille member t8 extends from the top of baffle 3i around the-tank 22 tothe lower vend of a second vertical baille 39,. The baille 33Yextends upward from the end of baille 33 lto the top plate 25 adjacentthe draft outlet conduit 35. The draft outlet 3E extends tangentiallyfrom the member 25, and is provided with a draft yadjuster opening lohaving a conventional automatic flap valve di mounted therein. vThe hotgaseous products of combustion pass upwardly .from combustion chamber I6into space A, and thence counter-clockwise over the baffle'35 to thevertical bailile 3l which directs them upward to lspace B. in space B,the Vhot gases again ktravel counterclockwise .over the baffle 38 to-the vertical baille e9 which directs them into the ltangentialoutlet 35to a conventional stack. The `inlet valve 4| admits additional air intothe outlet 35 -toperrnit control of the stack draft. The arrangement -ofhorizontal and vertical baffles and tangential outlet provides a -singlesomewhat spiral Apath for the combustion products and assures vquietopera tion, since there are no `plural paths which might create resonantconditions tending Vto amplify combustion noises or result in ;adefinite beat or pulsation of the draft. The arrangement of the vfourbaiilemembers 36, 3l, 38, and 39 also facili tates cleaning of the fluepassages since space B is conveniently reached Vthrough the draft inletopening 4o, and since space A may be reached through the inspectionopening |9, Lat which time the lower horizontal baille 36 may be removedfrom lits supporting lugs.

The heat exchanger shown in Figures l, 2, and 3f, is .enclosed in anouter housing .45 which may .be of Somewhat ovol Shape es Shown .Irsoros5 endo. The housing .45 vhas soonest exchanger positioned in QD@ 69d,and providQS ,Space ,in the .other end for a conventional liquid fuel.burner s6, the latter being connected to the opening i8 of the heaterassembly. The burner -46 yincludes a fuel pump lll, an air inlet 42, ablower ,43, and a motor 46 the blower 43 being connected to the openingi8 by a tube (i9, as illustrated in Figure 5. The top member 41 4of thehousing ,d5 is provided with suitable louvres 48, shown in rieure 4. toadmit air into .the housing .for .the .fool borner 46 and for the orafi;adjuster' 4e. The housing 45 is provided with removable panels toprovide access to the burner Y4b and ,to the .piping connections,aoomoto ofmforolsF and indi- Gator connections. The housing 45 may be provides with a heat-insulating lining in that 'por- 4 tion of the jacketextending around the heater assembly.

Where the heater assembly is to be used for supplying hot water toheating radiators or radiant heat panel units, a. circulating pump 50driven by a motor 5I is provided within the housing #.5 Yabove the fuelburner 46 and is connected to a low point return connection 32a vin thejacket lo, as shown in Figures 2 and 6. In such in stallaticns, hotwater for the radiators is taken from the tank through upper connection28, conducted to the heat radiators through conventional pipe systems,and returned to the heater assembly through-circulating pump 50 Withinthe housing 45. In such installations, the top steam outlet 3l is closedand the air space above the water level in tank 22 serves as a built-inexpansion tankl Where the heater assembly is to be used for supplyingsteam, steam generated in the space above the water level of tank 22 isconducted to its point of use through connection 3| Vand suitablepiping, and the condensate is returned to the boiler `through a returnline connected to inlety23. 1n such installations, an automatic lowwatercutoff at this point is desirable since the cutof mechanism will beexposed to a flow of clean return water which -prevents the accumulationof mud. Theprovision-Qf the 'stabiliaertube 27? serves as a Hartfordloop to prevent the loss of water through the returnli-ne. Thestabilizer vtube being within the boiler .-iiue assemblyleliminates thecost of providing an outside loop and eliminates unsightly piping.

An fadequatesupply of -hot water Yfor kdomestic purposes iis furnishedbythe tankless coil 29 immersedinihot water -i-n the tank 22. The waterVin tank 272 -is easily maintained at a temperature high enough to heatnormal demands of domestic Ahot water. Controls such -as disclosed in mycopending application rSerial Number 44,690, led August 1.7; 1948, nowPatent Number 2,540,055 issued January 30, 1951, may be used with theheater assembly shown herein to provide water of a desired temperaturein each of .several zones or portions of the assembly.

The provision of the draft adjuster to within the space enclosed byhousing d5 is advantageous in that any flue blast which may occur when afluid or vliquid fuel burner mechanism is started blows into the housingl5 where it is sucked up by the fuel burner blower and pumped backintoit-he combustion chamber. This arrangement avoids lblowing soot intothe atmosphere outside o f the unit, and also effectively reduces thenoise level .of .the operating heater assembly.

The improved baffle arrangement disclosed `herein also reduces theincise level of the esserlon bly, and increases the eeency .of theassembly through -a reduction in the draft loss. The baille arrangementalso permits easy cleaning of the flue passages and provides a singleflue passage which practically eliminates noise-producing resonantconditions.

It will be apparent that many changes vin minor details, proportions,and design may be carried out within the scope of this invention asdonned in the following claims.

I claim:

.1. .In a heater, e heat exchanger comprising ilo combination, avvertical annular water jacket, a closed water drum supported partlywithin and .spaced from the upper portion of ,said Water jacket,circulation tubes connecting said drum to said water jacket, a, circularcasing extending upward from the top of said water jacket surroundingand spaced from the upper portion of said drum, a horizontal baleextending from the lower end of said drum outward to said water jacketand closing a portion of the annular space between said drum and saidjacket, a vertical baille extending upward from one end of saidhorizontal baffle and within said annular space, a second horizontalbale extending between said drum and the top of said water jacket andextending laterally from the top of said vertical baffle and closinganother portion of the annular space between said drum and said jacket,and a second vertical baffle extending upward from that end of saidsecond horizontal baille removed from said first vertical balle, saidsecond Vertical baille extending radially from the upper portion of saiddrum to said circular casing, and a flue connection extendingtangentially from said circular casing, whereby said arrangement ofbales provides a single passage for conducting hot gases upward aroundsaid drum to said flue connection.

2. In a heater, a heat exchanger as set forth in claim 1, said annularwater jacket having an opening therethrough below the level of thebottom of said drum, and said flue connection having a. draft inletopening therein adjacent said circular casing, whereby portions of thehot gas passage defined by said baffles are accessible through said twoopenings for cleaning.

3. In a heater, a heat exchanger as set forth in claim 1, said waterjacket having means projecting from the inner wall thereof toward thebottom of said drum for removably supporting said rst mentionedhorizontal baille, whereby said rst horizontal baffle is removable toprovide access for cleaning portions of the flue passage between saiddrum and said jacket.

4. In a heater, a heat exchanger comprising in combination, an annularwater jacket, a water connection adjacent the upper end of said jacket,a water drum supported partly within and spaced inward from the upperportion of said jacket and extending above the upper end of said jacket,a circulation tube extending from the central portion of the bottom ofsaid drum downward and laterally into said water jacket substantiallymidway of the height of said jacket, a casing extending upward from theouter wall of said water jacket and ,spaced from and surrounding theupper portion of said drum and enclosing a flue space surrounding theupper portion of said drum, a stabilizer tube extending from the upperportion of said drum downward within said ilue space into the upper endof said water jacket adjacent to said connection, a flue connectionsecured to said casing, a housing surrounding said heat exchanger, adraft inlet in said ue connection and opening into said housing, and afuel burner including a blower in said housing,

whereby said blower circulates gases emitted from said draft inlet backinto said heat exchanger.

HENRY LEROY MOHN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 255,107 Gorton Mar'. 2l, 1882564,640 Patzelt `et al July 28, 1896 719,224 Jaeger Jan. 27, 1903813,507 Maag Feb. 27, 1906 1,113,232 Mergott Oct. 13, 1914 1,323,302Martens Dec. 2, 1919 1,542,219 Daechsel June` 16, 1925 1,741,633 Kemperet al Dec. 31, 1929 1,986,914 Avery Jan. 8, 1935 2,002,254 Treloar May21, 1935 2,048,393 Kroger July 21, 1936 2,059,128 Matthews Oct. 27, 19362,245,322 Bork June 10, 1941 2,463,958 Fisher Mar. 8, 1949 2,487,705Handley Nov. 8, 1949 2,540,055 Mohn Jan. 30, 1951 FOREIGN PATENTS NumberCountry Date 98,232 Germany Aug. 16, 1892 110,438 Switzerland June 1,1925 409,743 Great Britain May 3, 1934

